APA (7th ed.) Citation

Unstead, R. J. (1974). The Middle Ages (1. publ. in this ed.). Black.

Chicago Style (17th ed.) Citation

Unstead, R. J. The Middle Ages. 1. publ. in this ed. London: Black, 1974.

MLA (9th ed.) Citation

Unstead, R. J. The Middle Ages. 1. publ. in this ed. Black, 1974.